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WO2017156743A1 - 电子烟控制电路和控制方法、电子烟 - Google Patents

电子烟控制电路和控制方法、电子烟 Download PDF

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Publication number
WO2017156743A1
WO2017156743A1 PCT/CN2016/076595 CN2016076595W WO2017156743A1 WO 2017156743 A1 WO2017156743 A1 WO 2017156743A1 CN 2016076595 W CN2016076595 W CN 2016076595W WO 2017156743 A1 WO2017156743 A1 WO 2017156743A1
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WO
WIPO (PCT)
Prior art keywords
circuit
electronic cigarette
turned
switch
resistance
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PCT/CN2016/076595
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English (en)
French (fr)
Inventor
陈志平
Original Assignee
深圳麦克韦尔股份有限公司
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Publication date
Application filed by 深圳麦克韦尔股份有限公司 filed Critical 深圳麦克韦尔股份有限公司
Priority to PCT/CN2016/076595 priority Critical patent/WO2017156743A1/zh
Publication of WO2017156743A1 publication Critical patent/WO2017156743A1/zh

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/50—Control or monitoring
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors

Definitions

  • the invention relates to the field of electronic cigarette technology, in particular to a control circuit and a control method for an electronic cigarette, and to an electronic cigarette.
  • the electronic cigarette is an electronic device that supplies power to the heating wire through a battery, and the heating wire heats up the atomizing oil to achieve a smoking effect.
  • it is often necessary to measure the resistance of the heating wire.
  • the conventional electronic cigarette needs to connect the current-sense resistor in the power supply circuit.
  • the resistance of the starting filament is calculated by measuring the voltage value across the heating wire and the current value of the current-sense resistor. Since the current-sense resistor is always connected in series in the power supply loop, power is consumed during the operation of the electronic cigarette, so that the energy consumption of the entire circuit is high.
  • An electronic cigarette control circuit comprising: a heating element; a power supply device connected to the heating element for supplying power to the heating element; and a first switching circuit connected between the power supply device and the heating element to form a power supply circuit; a second switching circuit; a resistance detecting circuit; the second switching circuit and the resistance detecting circuit are connected between the power supply device and the heating element to form a detection circuit independent of the power supply circuit, and the resistance detecting circuit is used for Detecting a resistance value of the heating element; and a control unit respectively connected to the first switching circuit and the second switching circuit for controlling one of the first switching circuit and the second switching circuit to be turned on And the other is closed.
  • An electronic cigarette includes: a casing; and a control circuit disposed in the casing; the control circuit includes: a heating element; and a power supply device connected to the heating element for the heating element
  • the first switching circuit is connected between the power supply device and the heating element to form a power supply circuit
  • the second switching circuit; the resistance detecting circuit; the second switching circuit and the resistance detecting circuit are connected to the power supply device and the heating element Forming a detection loop independent of the power supply loop, the resistance detecting circuit is configured to detect a resistance value of the heating element; and a control unit, respectively, the first switching circuit and the second switching circuit a connection for controlling one of the first switching circuit and the second switching circuit to be turned on and the other to be turned off.
  • a method for controlling an electronic cigarette comprising the steps of: controlling the first switch circuit to be turned on and controlling the second switch circuit to be turned off, so that the power supply circuit is turned on and the detection circuit is broken. Turning on, the electronic cigarette enters a non-detection state; controlling the second switch circuit to be turned on and controlling the first switch circuit to be turned off, so that the detection circuit is turned on and the power supply circuit is disconnected, and the electronic cigarette enters detection a state; controlling the resistance detecting circuit to detect a resistance value of the heating element; and controlling the first switching circuit to be turned on and controlling the second switching circuit to be turned off, so that the power supply circuit is turned on and the detecting The circuit is broken and the electronic cigarette is switched back to the non-detected state.
  • the second switching circuit is controlled to be turned on by the control circuit only when it is necessary to acquire the resistance value of the heating element, so that the power supply circuit in which it is located is electrically conductive to form a conductive path.
  • the standard resistor is not connected to the conductive path of the heating element, and no additional power is consumed, thereby reducing power consumption.
  • FIG. 1 is a schematic block diagram of an electronic cigarette control circuit in an embodiment
  • FIG. 2 is a circuit schematic diagram of an electronic cigarette control circuit in an embodiment
  • FIG. 3 is a flow chart of a method of controlling an electronic cigarette in an embodiment.
  • the electronic cigarette control circuit is configured to control the electronic cigarette, and includes a power supply device 10, a heating element 20, a first switching circuit 110, a second switching circuit 120, a resistance detecting circuit 130, and a control unit 140.
  • the power supply device 10 is connected to the heat generating component 20 for supplying power to the heat generating component 20.
  • the power supply device 10 can be an energy storage device such as a battery.
  • the heating element 20 may be a heating wire or the like.
  • the heat generating component 20 is a heating wire having a positive temperature system, and its resistance value increases as the temperature increases.
  • the heat generating component 20 employs a heat generating component having a large positive temperature coefficient. At this time, the different resistance values of the heat generating component 20 correspond to different temperatures, so that the temperature of the heat generating component 20 can be used to measure the temperature thereof.
  • the first switching circuit 110 is connected between the power supply device 10 and the heat generating component 20 to form a power supply circuit.
  • the power supply circuit can be turned on to form a conductive path, and the electronic cigarette enters a non-detection state.
  • the working state of the electronic cigarette includes two states of non-detection and detection.
  • the heat generating component 20 enters a normal heat generation state, that is, the power supply device 10 supplies power to the heat generating component 20 to atomize the smoke liquid.
  • the first switching circuit 110 is turned off, the power supply circuit is turned off.
  • the first switching circuit includes a first switching tube for controlling the on and off of the power supply circuit.
  • the first switching transistor is a MOS transistor. In other embodiments, the first switching transistor can also be a transistor.
  • the second switching circuit 120 and the resistance detecting circuit 130 are connected in series between the power supply device 10 and the heat generating component 20 to form a detecting circuit independent of the power supply circuit.
  • the second switch circuit 120 includes a second switch tube for controlling the on and off of the detection circuit.
  • the second switching transistor is a MOS transistor. In other embodiments, the second switching transistor can also be a transistor.
  • the resistance detecting circuit 130 is configured to detect the resistance value of the heating element 20 and output the resistance value to the control unit 140.
  • the control unit 140 is connected to the first switch circuit 110, the second switch circuit 120, and the resistance detecting element 130, respectively.
  • the control unit 140 is configured to respectively control the first switch circuit 110 and The second switch circuit 120 is turned on and off. specifically.
  • the control unit 140 is configured to control one of the first switch circuit 110 and the second switch circuit 120 to be turned on and the other to be turned off.
  • the power supply circuit is turned on, the detection circuit is turned off, and the electronic cigarette enters a non-detection state. At this time, the power supply device 10 supplies power to the heat generating element 20 normally.
  • the resistance detecting circuit 130 operates to detect the resistance value of the heat generating element 20.
  • the resistance detecting circuit 130 outputs the detected resistance value to the control unit 140.
  • the control unit 140 acquires the current temperature of the heat generating component 20 based on the detected resistance value, and controls the power supply current of the heat generating component 20 and the like according to the current temperature.
  • the heat generating component 20 is still powered by the power supply device 10, so that the resistance detecting process does not affect the operation of the heat generating component 20, and the heat generating component 20 can still operate normally.
  • the control unit 140 is further configured to control the second switch circuit 120 to be turned on at a fixed frequency, and to control the turn-on duration of the second switch circuit 120 to be less than 100 micrometers.
  • the fixed frequency can be between 50 and 200 Hz.
  • the control unit 140 is turned on at a fixed frequency by controlling the second switching circuit 120, thereby controlling the resistance detecting circuit 130 to detect the resistance value of the heating element 20 at a fixed frequency, thereby facilitating the control unit 140 to control the temperature of the heating element 20.
  • the turn-on frequency of the second switch circuit 120 is 64 Hz.
  • the opening time of the second switching circuit 120 should be as short as possible to reduce power consumption.
  • the second switch circuit 120 has an on-time of less than 100 microseconds.
  • the working process of the electronic cigarette control circuit is specifically as follows: when receiving the control signal from the outside, the control unit 140 controls the first switching circuit 110 to be turned on and controls the second switching circuit 120 to be turned off. At this time, the electronic cigarette is in a non-detection state, and the power supply circuit is turned on, so that the heating element 20 is normally heated to atomize the liquid smoke.
  • the control signal can be emitted by the microphone or switch button of the electronic cigarette. Generally, the entire atomization process will last for 3 to 5 seconds, that is, the time for taking a cigarette.
  • the control unit 140 controls the second switching circuit 120 to be turned on at a fixed frequency to cause the detection circuit to be turned on, and the electronic cigarette enters the detection state.
  • the resistance detecting circuit 130 detects the resistance value of the heat generating element 20.
  • the control unit 140 controls the second switch circuit 120 after the second switch circuit 120 reaches the open time.
  • the first switch circuit 110 is turned on, the electronic cigarette is switched back to the non-detection state, and the power supply circuit is normally turned on.
  • the first switching circuit 110 and the second switching circuit 120 are alternately turned on, and the second switching circuit 120 is turned on at a set fixed frequency thereof to periodically detect the resistance of the heating element 20.
  • the first switching circuit 110 and the second switching circuit 120 are turned off.
  • the electronic cigarette control circuit, the resistance detecting circuit 130 and the second switching circuit 120 are connected in series in the detecting circuit, and the first switching circuit 110 is connected in series in the power supply circuit.
  • the control unit 140 is configured to control one of the first switch circuit 110 and the second switch circuit 120 to be turned on and the other to be turned off, so that the detection loop and the power supply loop are independently turned on.
  • the resistance detecting circuit 130 is not connected to the power supply circuit of the heating element 20, and only enters when the second switching circuit 120 is turned on, that is, when the detecting circuit operates, and no additional power is consumed, thereby reducing power consumption. Further, when the resistance value detecting circuit 130 performs the resistance value detection, the heat generating element 20 can still generate heat normally without affecting the normal operation of the heat generating element 20.
  • the first switching circuit includes a first MOS transistor Q1.
  • the second switching circuit includes a second MOS transistor Q2.
  • the resistance detecting circuit includes a standard resistor R6 and a voltage detecting element 210. The resistance of the standard resistor R6 is stable and in a known state.
  • the control unit then includes a microprocessor 220, a first PWM controller 230, and a second PWM controller 240.
  • the gate of the first MOS transistor Q1 is connected to the output end of the first PWM controller 230.
  • the source of the first MOS transistor Q1 is grounded, and the drain of the first MOS transistor Q1 is connected to the output terminal of the heat generating component 20.
  • the gate of the second MOS transistor Q2 is connected to the output of the second PWM controller 240, and the source of the second MOS transistor Q2 is grounded.
  • the drain of the second MOS transistor Q2 is connected in series with the standard resistor R6 and is connected to the output terminal of the heat generating component 20.
  • Both ends of the voltage detecting element 210 are respectively connected to both ends of the heat generating element 20 to detect voltages V1 and V2 across the heat generating element 20.
  • the microprocessor 220 is connected to the voltage detecting element 210, the first PWM controller 230, and the second PWM controller 240, respectively.
  • the microprocessor 220 controls the output pulse signals of the first PWM controller 230 and the second PWM controller 240 to independently control the opening and closing of the first MOS transistor Q1 and the second MOS transistor Q2.
  • the first MOS transistor Q1 is turned on and the second MOS transistor Q2 is turned off, the electronic cigarette is not inspected. Measure the status.
  • the detection loop does not work, that is, the standard resistor R6 does not consume additional power, thereby reducing power consumption and improving the use time of the power supply device 10.
  • the second MOS transistor Q2 is turned on at a fixed frequency, and the first MOS transistor Q1 is turned off while the second MOS transistor Q2 is turned on.
  • the electronic cigarette enters the detection state, and the heating element 20 is still powered by the power supply device 10, and can continue to heat normally to atomize the smoke liquid.
  • the heating element 20 is grounded in series with the standard resistor R6. Therefore, the detection voltage value V2 is the voltage on the standard resistor R6 (the voltage drop on the second MOS tube Q2 is small, which can be ignored), and the voltage V1 is the standard resistor R6 and the heat. The sum of the voltages of the components 20, so that the resistance of the heating element can be obtained according to the detection voltage values V1, V2 and the resistance of the standard resistor R6:
  • the standard resistor R6 Since the standard resistor R6 only works when the detection loop is turned on, it is inactive at other times, and the power consumption is small. At the same time, power consumption can be further reduced by controlling the turn-on duration of the second MOS transistor Q2. Therefore, the above-mentioned electronic cigarette control circuit does not need to select a resistor with a small resistance value due to power consumption problem, that is, the resistance value selection range of the standard resistor is large.
  • the resistance of the standard resistor R6 and the heat generating component 20 is substantially within the same order of magnitude. For example, when the resistance of the heating element 20 is 2 to 3 ⁇ , the resistance of the standard resistor R6 can be selected to be 2 ⁇ .
  • the resistance ratio of the heating element 20 and the standard resistor R6 is between 0.5 and 2, so that the measured voltage V2 is not too small, and the voltage V2 is not required to be processed by an amplifier circuit, and the circuit design is relatively simple. Moreover, by controlling the resistance ratio of the heating element 20 and the standard resistor R6 to between 0.5 and 2, it is also ensured that the resistance of the standard resistor R6 is not excessively large, so that no large power consumption is caused during the measurement. The energy saving effect is better.
  • the calculation formula for obtaining the resistance value of the heating element 20 also changes accordingly. at this time.
  • the voltage detecting component 210 can separately detect the voltages on the heat generating component 20 and the standard resistor R6, so that the resistance value of the heat generating component 20 is obtained according to the detected voltage value and the resistance value of the standard resistor R6, and can be calculated by the following formula:
  • the first switch circuit further includes a first resistor R1
  • the second switch circuit further includes a second resistor R2.
  • the first resistor R1 is connected in parallel between the gate of the first MOS transistor Q1 and the ground
  • the second resistor R2 is connected in parallel between the gate of the second MOS transistor Q2 and the ground.
  • the first resistor R1 and the second resistor R2 are both large resistance resistors.
  • the above electronic cigarette control circuit has the advantages of low energy consumption and good stability, so that the power supply device has a long use time.
  • the invention also relates to an electronic cigarette.
  • the electronic cigarette comprises a casing, and the casing is provided with a microphone head, a switch button, an atomizer and the like, and further comprises an electronic cigarette control circuit in any of the foregoing embodiments.
  • the operation of the electronic cigarette can be controlled by the above electronic cigarette control circuit. Due to the low power consumption of the control unit, the use time of the electronic cigarette is prolonged, the number of times of charging in the user unit time is reduced, and the user experience is better.
  • FIG. 3 is a diagram showing a method of controlling an electronic cigarette according to an embodiment, the electronic cigarette having the structure and control unit of the electronic cigarette as described above. The method includes the following steps.
  • the first switch circuit When receiving the external control signal, the first switch circuit is controlled to be turned on and the second switch circuit is controlled to be turned off, the power supply circuit is turned on, the detection circuit is disconnected, and the electronic cigarette enters a non-detection state.
  • the power supply device supplies power to the heat generating component, and the heat generating component generates heat to atomize the smoke liquid to generate a smoking effect.
  • the second switching circuit is turned on at a fixed frequency and is turned off after reaching the on-time.
  • control resistance detecting circuit detects the resistance value of the heating element.
  • step S330 is completed, and then steps S310 to S330 are performed, that is, After the electronic cigarette is turned on, the second switching circuit is turned on at a fixed frequency to periodically detect the resistance of the heating element.
  • steps S310 to S330 are performed, that is, After the electronic cigarette is turned on, the second switching circuit is turned on at a fixed frequency to periodically detect the resistance of the heating element.
  • the detection circuit can complete the resistance detection of the heating element.
  • the control circuit when the smoking is stopped, that is, when the control signal of the outside world is stopped (such as the switch button is released or the mouth of the human body leaves the microphone), the control circuit further includes controlling the first switch circuit and the second switch circuit to make the electronic cigarette Steps to stop working. That is, at the end of the smoking process, both the first switching circuit and the second switching circuit are controlled to be turned off, so that both the detecting circuit and the power supply circuit are stopped, thereby causing the heating element to stop operating.
  • the resistance detecting circuit enters the work only when the second switching circuit is turned on, that is, when the detecting circuit operates, and does not operate at other times, and does not consume additional power, thereby reducing power consumption. Moreover, when the resistance detecting circuit performs the resistance detection, the heating element can still heat normally, and does not affect the normal operation of the heating element.

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Abstract

一种电子烟及其控制电路、控制方法，该控制电路包括：发热元件(20)；供电装置(10)，与发热元件(20)连接，用于向发热元件(20)供电；第一开关电路(110)，连接在供电装置(10)与发热元件(20)之间以形成供电回路；第二开关电路(120)；阻值检测电路(130)；第二开关电路(120)和阻值检测电路(130)连接在供电装置(10)与发热元件(20)之间形成与供电回路相独立的检测回路，阻值检测电路(130)用于检测发热元件(20)的电阻值；以及控制单元(140)，分别与第一开关电路(110)和第二开关电路(120)连接，用于控制第一开关电路(110)和第二开关电路(120)中的一个开启且另一个关闭。

Description

电子烟控制电路和控制方法、电子烟 技术领域
本发明涉及电子烟技术领域，特别是涉及一种电子烟的控制电路和控制方法，还涉及一种电子烟。
背景技术
电子烟是一种通过电池为发热丝供电，发热丝发热使烟油雾化，从而实现吸烟效果的电子装置。在电子烟的使用过程中，经常需要对发热丝的阻值进行测量。传统的电子烟若要测量发热丝的阻值，则需要在供电回路中串联检流电阻。通过测量发热丝两端的电压值和检流电阻的电流值从而计算出发热丝的电阻。由于检流电阻一直串联在供电回路中，在电子烟工作过程中均会消耗功率，使得整个电路的能耗较高。
发明内容
基于此，有必要提供一种具有低能耗的电子烟控制电路和控制方法，还涉及一种电子烟。
一种电子烟控制电路，包括：发热元件；供电装置，与所述发热元件连接，用于向所述发热元件供电；第一开关电路，连接在供电装置与发热元件之间以形成供电回路；第二开关电路；阻值检测电路；所述第二开关电路和阻值检测电路连接在供电装置与发热元件之间形成与所述供电回路相独立的检测回路，所述阻值检测电路用于检测所述发热元件的电阻值；以及控制单元，分别与所述第一开关电路和所述第二开关电路连接，用于控制所述第一开关电路和所述第二开关电路中的一个开启且另一个关闭。
一种电子烟，包括：壳体；及设置于所述壳体内的控制电路；所述控制电路包括：发热元件；供电装置，与所述发热元件连接，用于向所述发热元 件供电；第一开关电路，连接在供电装置与发热元件之间以形成供电回路；第二开关电路；阻值检测电路；所述第二开关电路和阻值检测电路连接在供电装置与发热元件之间形成与所述供电回路相独立的检测回路，所述阻值检测电路用于检测所述发热元件的电阻值；以及控制单元，分别与所述第一开关电路和所述第二开关电路连接，用于控制所述第一开关电路和所述第二开关电路中的一个开启且另一个关闭。
一种如前述实施例所述的电子烟的控制方法，包括以下步骤：控制所述第一开关电路开启且控制所述第二开关电路关闭，使得所述供电回路导通且所述检测回路断开，所述电子烟进入非检测状态；控制所述第二开关电路开启且控制所述第一开关电路关闭，使得所述检测回路导通且所述供电回路断开，所述电子烟进入检测状态；控制所述阻值检测电路对所述发热元件的电阻值进行检测；以及控制所述第一开关电路开启且控制所述第二开关电路关闭，使得所述供电回路导通且所述检测回路断开，所述电子烟切回至非检测状态。
上述发热元件阻值检测电路和检测方法，第二开关电路仅在需要获取发热元件的电阻值时才由控制电路控制开启，从而使得其所在的供电回路导电形成导电通路。标准电阻在其他时间则并没有接入发热元件的导电通路中，不会额外消耗功率，从而降低了功耗。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他实施例的附图。
图1为一实施例中的电子烟控制电路的原理框图；
图2为一实施例中的电子烟控制电路的电路原理图；
图3为一实施例中的电子烟的控制方法的流程图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
图1为一实施例中的电子烟控制电路的原理框图。该电子烟控制电路用于对电子烟进行控制，其包括供电装置10、发热元件20、第一开关电路110、第二开关电路120、阻值检测电路130以及控制单元140。其中，供电装置10与发热元件20连接，用于向发热元件20供电。供电装置10可以为电池等储能装置。发热元件20则可以为发热丝等。在本实施例中，发热元件20为具有正温度系统的发热丝，其阻值随温度的升高而增大。优选的，发热元件20采用具有较大正温度系数的发热元件。此时，发热元件20的不同阻值即对应不同的温度，从而可以利用发热元件20的阻值来测量其温度。
第一开关电路110连接于供电装置10和发热元件20之间，以形成供电回路。当第一开关电路110开启时可以使得供电回路导通形成导电通路，电子烟进入非检测状态。在本实施例中，电子烟的工作状态包括非检测和检测两种状态。此时，发热元件20进入正常发热状态，即由供电装置10向发热元件20供电以雾化烟液。当第一开关电路110断开时，供电回路断开。第一开关电路包括第一开关管，用于控制供电回路的通断。在一实施例中，第一开关管为MOS管。在其他的实施例中，第一开关管也可以为晶体三极管。
第二开关电路120与阻值检测电路130串联于供电装置10和发热元件20之间，以形成与供电回路相互独立的检测电路。第二开关电路120包括第二开关管，用于控制检测回路的通断。在一实施例中，第二开关管为MOS管。在其他的实施例中，第二开关管也可以为晶体三极管。
阻值检测电路130用于检测发热元件20的电阻值，并将该电阻值输出给控制单元140。控制单元140分别与第一开关电路110、第二开关电路120以及阻值检测元件130连接。控制单元140用于分别控制第一开关电路110和 第二开关电路120的开启和关闭。具体地。控制单元140用于控制第一开关电路110和第二开关电路120中的其中一个开启且另一个关闭。当第一开关电路110开启且第二开关电路120关闭时，供电回路导通，检测回路断开，电子烟进入非检测状态。此时，由供电装置10向发热元件20正常供电。当第二开关电路120开启且第一开关电路110关闭时，供电回路断开，检测回路导通，电子烟进入检测状态。此时，阻值检测电路130运行，对发热元件20的电阻值进行检测。在本实施例中，阻值检测电路130将检测到的电阻值输出给控制单元140。控制单元140根据检测到的电阻值获取到发热元件20当前的温度，并根据当前温度对发热元件20的供电电流等进行相应的控制。在检测状态中(即检测回路导通过程中)，发热元件20仍由供电装置10供电，从而使得阻值检测过程并不会对发热元件20的工作产生影响，发热元件20仍能够正常工作。
控制单元140还用于控制第二开关电路120以固定频率开启，且控制第二开关电路120的开启时长小于100微米。固定频率可以在50～200Hz之间。控制单元140通过控制第二开关电路120以固定频率开启，从而控制阻值检测电路130以固定频率对发热元件20的阻值进行检测，进而方便控制单元140对发热元件20的温度进行控制。在本实施例中，第二开关电路120的开启频率为64Hz。第二开关电路120的开启时长应尽可能短，以降低能耗。在一实施例中，第二开关电路120的开启时长小于100微秒。
上述电子烟控制电路的工作过程具体如下：控制单元140在接收到外界的控制信号时，控制第一开关电路110开启且控制第二开关电路120断开。此时，电子烟处于非检测状态，供电回路导通，使得发热元件20正常发热以雾化烟液。控制信号可以由电子烟的咪头或者开关按键发出。一般整个雾化过程会维持3～5秒，即抽一口烟的时间。在发热元件20工作过程中，控制单元140会控制第二开关电路120以固定频率开启从而使得检测回路导通，电子烟进入检测状态。阻值检测电路130对发热元件20的电阻值进行检测。控制单元140在第二开关电路120的达到开启时长后控制第二开关电路120 关闭，第一开关电路110开启，电子烟切回至非检测状态，供电回路正常导通。在整个吸烟过程中，第一开关电路110和第二开关电路120交替开启，且第二开关电路120按其设定的固定频率开启，以定期对发热元件20的阻值进行检测。整个吸烟过程结束时，关闭第一开关电路110和第二开关电路120。
上述电子烟控制电路，阻值检测电路130与第二开关电路120串联于检测回路中，第一开关电路110则串联于供电回路中。控制单元140用于控制第一开关电路110和第二开关电路120中的一个开启且另一个关闭，从而使得检测回路和供电回路相互独立开启。阻值检测电路130并不接入发热元件20的供电回路中，仅在第二开关电路120开启时也即检测回路工作时进入工作，不会额外消耗功率，从而降低了功耗。并且，阻值检测电路130在进行阻值检测时，发热元件20仍能够正常进行发热，不会对发热元件20的正常工作产生影响。
图2为一实施例中的电子烟控制电路的电路原理图。参见图2，在本实施例中，第一开关电路包括第一MOS管Q1。第二开关电路包括第二MOS管Q2。阻值检测电路包括标准电阻R6和电压检测元件210。标准电阻R6的阻值稳定且处于已知状态。控制单元则包括微处理器220、第一PWM控制器230和第二PWM控制器240。其中，第一MOS管Q1的栅极与第一PWM控制器230的输出端连接。第一MOS管Q1的源极接地，第一MOS管Q1的漏极连接于发热元件20的输出端。第二MOS管Q2的栅极与第二PWM控制器240的输出端连接，第二MOS管Q2的源极接地。第二MOS管Q2的漏极串联所述标准电阻R6后与发热元件20的输出端连接。电压检测元件210的两端分别与发热元件20的两端连接，以检测发热元件20两端的电压V1和V2。微处理器220分别与电压检测元件210、第一PWM控制器230和第二PWM控制器240连接。
微处理器220对第一PWM控制器230和第二PWM控制器240的输出脉冲信号进行控制进而独立控制第一MOS管Q1和第二MOS管Q2的开启和关闭。第一MOS管Q1开启且第二MOS管Q2关闭时，电子烟处于非检 测状态。此时由于第二MOS管Q2断开，检测回路并不工作，即标准电阻R6并不额外消耗功率，从而降低了功耗，提高了供电装置10的使用时间。在电子烟开启后，第二MOS管Q2以固定频率开启，且开启第二MOS管Q2的同时关闭第一MOS管Q1。此时，电子烟进入检测状态，发热元件20仍由供电装置10供电，可以持续正常发热，以雾化烟液。发热元件20串联标准电阻R6后接地，因此，检测电压值V2即为标准电阻R6上的电压(第二MOS管Q2上的压降较小，可以忽略)，电压V1则为标准电阻R6和发热元件20的电压之和，从而根据检测电压值V1、V2以及标准电阻R6的阻值就可以求取出发热元件的阻值：
Figure PCTCN2016076595-appb-000001
由于标准电阻R6仅在检测回路导通时才工作，在其他时间则处于不工作状态，其产生的功耗较小。同时，通过对第二MOS管Q2的开启时长进行控制，可以进一步减少功耗。因此，上述电子烟控制电路无需因为功耗问题选用阻值较小的电阻，也即标准电阻的阻值选择范围较大。在本实施例中，标准电阻R6和发热元件20的阻值大致在同一个数量级之内。例如，当发热元件20的阻值为2～3Ω，标准电阻R6的阻值可以选择2Ω。优选的，发热元件20和标准电阻R6的阻值比例在0.5～2之间，从而可以确保测量到的电压V2不会太小，无需增加放大电路等对电压V2进行处理，电路设计较为简单。并且，通过将发热元件20和标准电阻R6的阻值比例控制在0.5～2之间也可以确保标准电阻R6的阻值不会过大，因而在测量过程中不会带来较大的功耗，节能效果较好。
在其他的实施例中，由于标准电阻R6在检测回路的位置关系发生变化，获取发热元件20的电阻值的计算公式也会相应的变化。此时。电压检测元件210可以对发热元件20以及标准电阻R6上的电压进行分别检测，从而根据检测到的电压值以及标准电阻R6的电阻值获取到发热元件20的阻值，即可通过以下公式计算：
Figure PCTCN2016076595-appb-000002
参见图2，在本实施例中，第一开关电路还包括第一电阻R1，第二开关电路还包括第二电阻R2。第一电阻R1并联于第一MOS管Q1的栅极和地之间，第二电阻R2并联于第二MOS管Q2的栅极和地之间。第一电阻R1和第二电阻R2均为大阻值电阻。通过在第一MOS管Q1和第二MOS管Q2的栅极和地之间串联大阻值电阻可以有效抑制振荡，提高电路的稳定性。
上述电子烟控制电路，具有能耗低且稳定性较好的优点，从而使得供电装置的使用时间较长。
本发明还涉及一种电子烟。该电子烟包括壳体，壳体内设置有咪头、开关按键、雾化器等结构，其还包括前述任一实施例中的电子烟控制电路。通过上述电子烟控制电路可以对电子烟的工作进行控制。由于控制单元的功耗较低，从而使得电子烟的使用时间延长，减少了用户单位时间内的充电次数，用户体验感较好。
图3为一实施例中的电子烟的控制方法，该电子烟具有如前所述的电子烟的结构以及控制单元。该方法包括以下步骤。
S310，控制第一开关电路开启且控制第二开关电路关闭，使得供电回路导通且检测回路断开，电子烟进入非检测状态。
当接收到外界的控制信号时，控制第一开关电路开启并控制第二开关电路关闭，供电回路导通，检测回路断开，电子烟进入非检测状态。此时，由供电装置向发热元件供电，发热元件发热以雾化烟液，产生吸烟效果。
S320，控制第二开关电路开启且控制第一开关电路关闭，使得检测回路导通且供电回路断开，电子烟进入检测状态。
在本实施例中，第二开关电路以固定频率开启且在达到开启时长后即关闭。
S330，控制阻值检测电路对发热元件的电阻值进行检测。
在完成阻值检测后即完成步骤S330后返回执行步骤S310～S330，即在 电子烟的开启后以固定频率开启第二开关电路，以定期对发热元件的阻值进行检测。在一实施例中，在完成步骤S330后，还会先判断第二开关电路的开启时长是否达到设定的开启时长，若达到则返回执行S310及其后续步骤，否则继续执行S330，确保阻值检测电路能够完成对发热元件的阻值检测。
上述控制方法，在吸烟结束时，即停止接收到外界的控制信号时(如开关按键松开或者人体嘴部离开咪头)，还包括控制第一开关电路和第二开关电路关闭，使得电子烟停止工作的步骤。即，在吸烟过程结束时，控制第一开关电路和第二开关电路均关闭，从而使得检测回路和供电回路均停止工作，进而使得发热元件停止工作。
上述电子烟的控制方法，阻值检测电路仅在第二开关电路开启时也即检测回路工作时进入工作，其他时间并不运行，不会额外消耗功率，从而降低了功耗。并且，阻值检测电路在进行阻值检测时，发热元件仍能够正常进行发热，不会对发热元件的正常工作产生影响。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (20)

  1. 一种电子烟控制电路，其特征在于，包括：
    发热元件；
    供电装置，与所述发热元件连接，用于向所述发热元件供电；
    第一开关电路，连接在供电装置与发热元件之间以形成供电回路；
    第二开关电路；
    阻值检测电路；所述第二开关电路和阻值检测电路连接在供电装置与发热元件之间形成与所述供电回路相独立的检测回路，所述阻值检测电路用于检测所述发热元件的电阻值；以及
    控制单元，分别与所述第一开关电路和所述第二开关电路连接，用于控制所述第一开关电路和所述第二开关电路中的一个开启且另一个关闭。
  2. 根据权利要求1所述的电子烟控制电路，其特征在于，所述控制单元用于控制所述第二开关电路以固定频率开启；所述固定频率在50～200赫兹之间。
  3. 根据权利要求2所述的电子烟控制电路，其特征在于，所述控制单元还用于控制所述第二开关电路的开启时长小于100微秒。
  4. 根据权利要求1所述的电子烟控制电路，其特征在于，所述第一开关电路包括第一开关管；所述第一开关管的输入端与所述发热元件的输出端连接；所述第一开关管的输出端接地；所述第一开关管的控制端与所述控制单元连接；
    所述第二开关电路包括第二开关管，所述第二开关管的输入端与所述阻值检测电路连接后与所述发热元件的输出端连接；所述第二开关管的输出端接地；所述第二开关管的控制端与所述控制单元连接。
  5. 根据权利要求4所述的电子烟控制电路，其特征在于，所述第一开关管为第一MOS管，所述第二开关管为第二MOS管；所述第一开关电路还包括第一电阻；所述第一电阻并联于所述第一MOS管的栅极和地之间；所述第二开关电路还包括第二电阻；所述第二电阻并联于所述第二MOS管的栅极和 地之间。
  6. 根据权利要求4所述的电子烟控制电路，其特征在于，所述控制单元包括微处理器、第一PWM控制器和第二PWM控制器；所述微处理器分别与所述第一PWM控制器、第二PWM控制器以及所述阻值检测电路连接；所述第一PWM控制器还与所述第一开关管的控制端连接；所述第二PWM控制器还与所述第二开关管的控制端连接。
  7. 根据权利要求1所述的电子烟控制电路，其特征在于，所述阻值检测电路包括标准电阻和电压检测元件；所述标准电阻串联于所述检测回路中；所述电压检测元件用于检测所述标准电阻和所述发热元件上的电压并输出检测电压值；所述控制单元还与所述电压检测元件连接，用于根据所述检测电压值和所述标准电阻的电阻值获取所述发热元件的电阻值。
  8. 根据权利要求1所述的电子烟控制电路，其特征在于，所述标准电阻的阻值与所述发热元件的阻值在同一数量级。
  9. 根据权利要求8所述的电子烟控制电路，其特征在于，所述发热元件与所述标准电阻的阻值比例在0.5～2之间。
  10. 根据权利要求1所述的电子烟控制电路，其特征在于，所述发热元件为具有正温度系数的发热元件。
  11. 一种电子烟，包括：
    壳体；及
    设置于所述壳体内的控制电路；所述控制电路包括：
    发热元件；
    供电装置，与所述发热元件连接，用于向所述发热元件供电；
    第一开关电路，连接在供电装置与发热元件之间以形成供电回路；
    第二开关电路；
    阻值检测电路；所述第二开关电路和阻值检测电路连接在供电装置与发热元件之间形成与所述供电回路相独立的检测回路，所述阻值检测电路用于检测所述发热元件的电阻值；以及
    控制单元，分别与所述第一开关电路和所述第二开关电路连接，用于控制所述第一开关电路和所述第二开关电路中的一个开启且另一个关闭。
  12. 根据权利要求11所述的电子烟，其特征在于，所述控制单元用于控制所述第二开关电路以固定频率开启；所述固定频率在50～200赫兹之间。
  13. 根据权利要求12所述的电子烟，其特征在于，所述控制单元还用于控制所述第二开关电路的开启时长小于100微秒。
  14. 根据权利要求11所述的电子烟，其特征在于，所述第一开关电路包括第一开关管；所述第一开关管的输入端与所述发热元件的输出端连接；所述第一开关管的输出端接地；所述第一开关管的控制端与所述控制单元连接；
    所述第二开关电路包括第二开关管，所述第二开关管的输入端与所述阻值检测电路连接后与所述发热元件的输出端连接；所述第二开关管的输出端接地；所述第二开关管的控制端与所述控制单元连接。
  15. 根据权利要求14所述的电子烟，其特征在于，所述第一开关管为第一MOS管，所述第二开关管为第二MOS管；所述第一开关电路还包括第一电阻；所述第一电阻并联于所述第一MOS管的栅极和地之间；所述第二开关电路还包括第二电阻；所述第二电阻并联于所述第二MOS管的栅极和地之间。
  16. 根据权利要求14所述的电子烟，其特征在于，所述控制单元包括微处理器、第一PWM控制器和第二PWM控制器；所述微处理器分别与所述第一PWM控制器、第二PWM控制器以及所述阻值检测电路连接；所述第一PWM控制器还与所述第一开关管的控制端连接；所述第二PWM控制器还与所述第二开关管的控制端连接。
  17. 根据权利要求11所述的电子烟，其特征在于，所述阻值检测电路包括标准电阻和电压检测元件；所述标准电阻串联于所述检测回路中；所述电压检测元件用于检测所述标准电阻和所述发热元件上的电压并输出检测电压值；所述控制单元还与所述电压检测元件连接，用于根据所述检测电压值和所述标准电阻的电阻值获取所述发热元件的电阻值；所述标准电阻的阻值与 所述发热元件的阻值在同一数量级。
  18. 根据权利要求17所述的电子烟，其特征在于，所述发热元件与所述标准电阻的阻值比例在0.5～2之间。
  19. 一种如权利要求11所述的电子烟的控制方法，包括以下步骤：
    控制所述第一开关电路开启且控制所述第二开关电路关闭，使得所述供电回路导通且所述检测回路断开，所述电子烟进入非检测状态；
    控制所述第二开关电路开启且控制所述第一开关电路关闭，使得所述检测回路导通且所述供电回路断开，所述电子烟进入检测状态；
    控制所述阻值检测电路对所述发热元件的电阻值进行检测；以及
    控制所述第一开关电路开启且控制所述第二开关电路关闭，使得所述供电回路导通且所述检测回路断开，所述电子烟切回至非检测状态。
  20. 根据权利要求19所述的方法，其特征在于，所述控制所述第二开关电路开启且控制所述第一开关电路关闭的步骤包括：控制所述第二开关电路以固定频率开启，所述固定频率在50～200赫兹之间。
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